57087821 has 8 divisors (see below), whose sum is σ = 65427840. Its totient is φ = 48793968.

The previous prime is 57087791. The next prime is 57087829. The reversal of 57087821 is 12878075.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57087821 - 2²² = 52893517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57087829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8846 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (8178480).

Almost surely, 2^57087821 is an apocalyptic number.

It is an amenable number.

57087821 is a deficient number, since it is larger than the sum of its proper divisors (8340019).

57087821 is a wasteful number, since it uses less digits than its factorization.

57087821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23083.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 57087821 is about 7555.6482845617. The cubic root of 57087821 is about 385.0476603728.

The spelling of 57087821 in words is "fifty-seven million, eighty-seven thousand, eight hundred twenty-one".